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Cheapest one-way flights from Washington (IAD) to Lisbon (LIS), May

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Dates, airline, and price
Dates	Airline	Price
02 May	ITA Airways
16 May	Royal Air Maroc
23 May	Royal Air Maroc
21 May	Royal Air Maroc
22 May	Porter Airlines (Canada) Ltd
02 May	United Direct Flight
16 May	TAP Direct Flight
23 May	TAP Direct Flight
22 May	TAP Direct Flight
21 May	TAP Direct Flight

deals for return flights from Washington to Lisbon in May.

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Updated Jul 13, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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Cheapest one-way flights from Washington (IAD) to Lisbon (LIS), May

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